refactor: Improve filter parsing and error handling

Co-authored-by: aider (openai/andrew/openrouter/sonoma-sky-alpha) <aider@aider.chat>

src/parser/filter_parser.rs

@@ -7,6 +7,8 @@ use serde_json;
 #[grammar = "filter.pest"]
 pub struct FilterParser;
 
+use crate::Rule;
+
 #[derive(Debug)]
 pub struct Filter {
     pub name: String,
@@ -65,7 +67,7 @@ pub fn parse_filter_string(input: &str) -> Result<Vec<Filter>, Box<dyn std::erro
 }
 
 fn parse_option_value(input: &str) -> Result<serde_json::Value, Box<dyn std::error::Error>> {
-    serde_json::from_str(input).map_err(|e| Box::new(e) as Box<dyn std::error::Error + Send + Sync + 'static>)
+    serde_json::from_str(input).map_err(|e| Box::new(e) as Box<dyn std::error::Error>)
 }
 
 #[cfg(test)]